The photo-dechlorination rate was of CFC12 measured in order to develop equipment for converting CFC 12 into fluoroether in NaOH-methanol by UV irradiation. CFC 12 is converted into HCFC 22 by the photo-dechlorination, and this is followed by Williamson ether synthesis give to fluoroether (CHF2OCH3). In this paper, the photo-dechlorination rate of the CFC 12-fluoroether convertor was analyzed. It was found that the reaction rate was proportional to the one half power of the light intensity and the three-halves power of CFC 12 partial pressure, and the rate was increased by NaCl particles which deposited in the methanol solution scattering the light. From these results, a photoreaction mechanism was proposed in which the methoxy ion radical participates in a chain reaction.